lexoffice allows small-medium businesses to step into a new era: cloud bookkeeping with an average booking automation rate of up to 70 %. In this talk, we will share key (data) ingredients for saving millions of hours for more than 250k customers and for scaling our daily work: experimentation setup, utilized metrics, insights to applied (ML) models, their validation and lifecycle in production. In addition, we will share the organizational evolution along this data product journey.